For a majority of Service Providers, a significant portion of their revenues are still derived from data and voice services based on legacy transport technologies. Although Layer 3 MPLS VPNs fulfill the market need for some customers, they have some drawbacks. Ideally, carriers with existing legacy Layer 2 and Layer 3 networks would like to move toward a single backbone while new carriers would like to sell the lucrative Layer 2 services over their existing Layer 3 cores. The solution in these cases is a technology that would allow Layer 2 transport over a Layer 3 infrastructure.

The purpose of this book is to provide a theory of Digital Power Electronics and its applications. It is well organized in 400 pages and over 300 diagrams. Traditionally, Power Electronics is analyzed by the analog control theory. For over a century, people have enjoyed analog control in Power Electronics, and good results in the analog control and its applications in Power Electronics mislead people into an incorrect conclusion that Power Electronics must be in analog control scheme. The mature control results allowed people to think that Power Electronics is a sunset knowledge.We would like to change these incorrect conclusions, and confer new life onto the traditional Power Electronics. In this book the authors initially introduce the digital control theory applied to Power Electronics, which is completely different from the traditional control scheme.